| 近50 a坝上后山地区人畜压力与沙漠化景观界线之间的互动关系 |
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| 引用本文： | 孙武.近50 a坝上后山地区人畜压力与沙漠化景观界线之间的互动关系[J].中国沙漠,2000,20(2):154-158. |
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| 作者姓名： | 孙武 |
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| 作者单位： | 华南师范大学,地理系,广东,广州,510631 |
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| 摘 要： | 对河北坝上内蒙古乌盟后山区解放以来农业人口、特畜头数与水花总体退化状态、退化在空间界线上互动关系的研究表明，近５０a人畜压力界线的多显示出高度的同步性，８０年代 以前向北推，以后停滞回撤，只有东部持续前移。相应地沙漠化总体退化状态普遍加重，退化景凤界线向南推进。表现在程度类型界线上，轻度化范围向南退缩，中度界线向东南推进，类型在旱作北界附近由分散分布发展为东西连绵的重度轴；反映在退化地貌类型上，农田
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| 关 键 词： | 坝上后山地区 人畜压力 沙漠化景观界线 互动 |
Interaction between Desertification Boundary and Pressure Lines of Population and Husbandry in the Houshan Area of Bashang since 1950 |
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| SUN Wu.Interaction between Desertification Boundary and Pressure Lines of Population and Husbandry in the Houshan Area of Bashang since 1950[J].Journal of Desert Research,2000,20(2):154-158. |
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| Authors: | SUN Wu |
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| Abstract: | In the paper, approach is made to the interaction between boundaries of degradation land and the pressure on land in spatial movements in the Houshan area of Bashang since liberation. Pressure on land for population and husbandry changes in almost the same way which grows all the area, but higher to the north, especially in the northeast part during 1950\_1996. The creeping of pressure lines displays differently,from 1950\_1980 lines in area of Houshan move north and get back since 1980,only that in Bashang pushes northeast continuously during 1950\_1996. In the response, land degradation severity aggravates through the area, light degree of desertified land decreases, moderate degree line of >20% moves towards southeast by 45 km. The types of different severity degrees that distributed separately in the 1970's link together from west to east, forming an axis of severity degree in the 1980's. In the desertified landscape, farmland experiencing wind erosion of >30% develops rapidly moves northward by 30 km, pebble line of >30% swifts south and west in large scale, but the sandy line pushes south a little and remains unchanged in the east. Getting lower in speed even withdraw in movements for pressure line reveals the regulation of population capacity by land degradation since 1980's. |
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| Keywords: | Houshan area of Bashang population and livestock pressure desertified landscape interaction |
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